Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72a12e68a85798c…

MALICIOUS

PDF

91.7 KB Created: 2021-07-16 14:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c83b9beedc9da907c31386104b54b2b SHA-1: 8e380c40f22bef86501f1e2ec58311ee761b4ad1 SHA-256: b72a12e68a85798c17b314d31e6dbfdb5f2d9f5a46094125e746dfc3684d278a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing form plugins for file uploads. These links likely serve as a link farm to distribute malicious content. ClamAV detection and ML classification strongly indicate a malicious phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9523

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af94ce16bee---rusugoxisumerajubabatidi.pdf In PDF document text
    • http://songhandiban.com/uploadfile/file/2021061912221373499.pdfIn PDF document text
    • http://talleresjpg.es/img/file/76501286957.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083b507c0ed5---worupolapa.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b821e46efcdeef87061f82808c806298/98723098326.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf0dab96a5---42206949747.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/efe09bb3a0a7d66e2ad9b27b44d7e35c/28406577277.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/fd35a817aca3556ebe1ad2b2ea075019/40994822244.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/rurewil.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/96948996294.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/29430929755.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160797edcd23ee---39557084830.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/50468666750.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/lubawalowasumogigulam.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a349c613---84016571907.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084422c92bf2---51796310823.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/13794474871.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/tesakanetikesi.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/41a56678b90b70637979d7b0800d74da/26757356692.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f25a8984ad---fipaziselidisekipabuzeda.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbcce9ac65---37369661237.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1670de60---2654544096.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/12cb4d3f026c9e920b6612d3766d7296/52594173037.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a3e795f52---21675222181.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16070d3440708e---linakipijakidofagi.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/81749387183.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/181612522833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=definition+of+burblePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 16588 bytes
SHA-256: 336bc499337d26481239fa14b49763d5428908a9d3903833c3c5a65ee935fd0b
font_01_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 10116 bytes
SHA-256: e98395d230bcd5dd250aef19ef47324764061e5e76db2b5cb946c8e9fa5ababd
font_02_sfnt_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 22068 bytes
SHA-256: f233ae3b69231eecb31486a043e1b6587e236f2243cc9c3bd21342a377c566fd
font_03_sfnt_off00013ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACE 2832 bytes
SHA-256: fa8bad6c6be24c22c50eafbb3a3fd27c695265ce9e2da5b0b9271cd88d50639d
font_04_sfnt_off000146de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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